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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f40713802123206c1c2b9164b77b5ef54ca2b0519e6ceba488399e7c21725fe9' 
  AND token = 'X8R4P5L9GaZeIqYtRJkhywWJRylhEWgB0kyDxxBMRHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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