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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '153428df5a526282f45d3cc07a58eae222afae6c1ef72f4f01e3f4bab5b4b919' 
  AND token = '9qWqHcSVWayc6FM6oKDqI+46Lk6umZ7AAUsL6JcD7qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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