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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ddfe13fcf87930222082cc7198c9a07bb6cb7e9eaff0fcf60fb6849af2db8c2' 
  AND token = 'Bzxbfy8woIa7HjI/comAjZqIwD3QI24SOHK0sH3K838=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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