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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0e42faace823697f74d1b41a5c492f9813c088b192686bae0a84d7eaa735637' 
  AND token = 'zotoGOwjbHQNDaPtaG7OAS7fk1fneIkhjKSikn0IF2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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