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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41260a9d050c2071a32809edf6bf89a460cb7df00bf81a6956783941df056fcb' 
  AND token = 'HO/2KlOiLOdUylSNhlHK1Udva6lj7hIEwgAbJ19nt7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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