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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '595458c629e4df7d49377d100a75d90e524129eb12a3700ef7a0cb73f23eb2af' 
  AND token = 'AYjvKvOnEEdHFeyAABnrJ1nciCgULcJIJEl6jYViiPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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