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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69adae99a350a81f6eb2c93b5766f523da89a9c86d9b7abd3e97ffc27bf25c93' 
  AND token = '0IGW/sysQR7p3tufoR0n2xD1icrdixbJqLjfmOf0SOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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