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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b323bf1f8085fc7ae31cc22cc156a3329d1abd2920d3a8938baa855ffc892e1' 
  AND token = 'E9vA5D+PQZmjXvnW+Xek2e+5jiy9CkYGFNitUYSzn3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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