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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32ce88015da3a42598e54f0f336fb3bedc47df8bb448e0e630dc0955ab84bcdc' 
  AND token = 'S1mJwLcz65hdRRktwnWR0O6RaCkXSSH/DcL24MTurY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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