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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e4b1bd18c12d6ca4725de09c0ff844ff403c39a1761d0decc2ab1e3077e0353' 
  AND token = 'Eohpf3OXlJades3oZAgmOWFKbSrTDHqdt0f/2qiUXoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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