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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92adb05409f9172f69f7b47831b8a4f1c5fb728eb46c9b6b0675a2e678eaaae0' 
  AND token = '0CcyTt4ovyBDh3BWUacru8CuXSfEPz9lX2gRQD/NRHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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