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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6376085c31a9983c9299eb1bf565017f586ee0180a40d9feca9f96475fd90a17' 
  AND token = 'IDPckLWlsuFaFAeVu7jRJmfHX/Hm4oMMJ74+QiooHuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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