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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9996f3ba1a5d55de5239c64a653845cff16b9352fccaad5591c345ec9243e258' 
  AND token = 'Z44X3ELPjTOY8G8l7JZoYoeK8qMnwuXunc46Ckmqz6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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