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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61e38429a29cca71d9f89f40bf7e286b227497f472229e0e87a3edbb745228c3' 
  AND token = '14KrBouUbIKUBcMQUfLvZ+YQzPXU9iOGeywwUE1RAQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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