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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cc469a556d07e3d7c1147be7f90c83511ac299d956e6e2d49d2781a024665b1' 
  AND token = 's3RIja6ADDu6+zNZusEeqSOPPyU8mPXro54pEsEdee4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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