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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2ca7eeedc80f004d0ad53b3e074ac6a40bb67af858be94d0de44f1a902dac16' 
  AND token = 'v17RwZub1otTWEIlpbc2LHaUGsNvcO9WymGWO6hK9Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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