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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8386766127ec065ab201f983c6460c73657c337542f05b50dea28c734e601db' 
  AND token = 'C+WJH+nuTn3710a4BA4GnMRAF0oFY3eWedyy2MnqOZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}