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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60e0c2e9d629cd533d9431632393937f2f6c40af978c08434659d058bc2260dd' 
  AND token = 'Rd3y8RwQbputW83k/XpHi7/fsWIt6ZrxEhLrNpnmBoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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