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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c74291601f11a435a148e8396f9ac2e43dac25663cd37bf2540beaf7cf7aa2a' 
  AND token = '0v1ZL2zoOeN8szRHMvWkjX3bKHbsEtHs9PZp7MW5/04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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