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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27eb2a169324a13bb1ba4e25b0b2594f427b47f62e9b48fe468fc905d7ba1d97' 
  AND token = 'TVXjEvloOWNl4VOhpCPv0JQqoyCDMCt3AhSS/r/nQ8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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