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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67525c05e87488328d28960a58cc1eb615a88678b80300a0df0e5a36d6f2eecc' 
  AND token = 'Di2K8IxRR1uNP9IWRlWxzfd8kFqe2xjPPEa3CfaAQGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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