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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f3ccb88413c7b08209b62c578a32c9131a1e30a558818e83db81703b6201c5a' 
  AND token = '3d1HxmLlXFeyeg6Z8ZYqRAUYuQ4vUj1m2HPqdfTFZc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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