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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f9b62c0369d2a758679e4e3591cdb82060bb5e1cefc84b6a3be3c135745181c' 
  AND token = '0NJIDezMy3TxpY8/lrEXwS+WMWv36z3pCRk5h1/Ke9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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