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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c6e2a7a86597fc6b9992d7adecb5e622017b2cf451d1d6cc99847f4529f126d' 
  AND token = 'JD5eC9LXvJe7aMYeb4WENPJfcxS0sTBwPtyS0lnaaYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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