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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '612032a0a0d20111df25e8263151669db78a18e0aaf7eb5f0ecd722adbe81cd6' 
  AND token = '8Z4IMGUB6DToEgaStzmL08l294oWcJtn7bkNxKC0KxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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