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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74da4c1fd684b780ebccf934250695ead4550c8f95670bde84842bb8a87eb792' 
  AND token = 'r3gtGaL4GqS3NO7ZT6BG4gFPGdTeDeVrG1EBJUadovc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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