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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '047dc766a227679b64fc3614b8177869e732fb8bcae4582f252f1b778804f795' 
  AND token = '24WQQVvexMVP5jFHyzU/P7Ex9Qi2YO1iOjg5iReI7lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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