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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e39bb1bf46b6b14b6c05591639b4dc8ddd7e46bfba65dba8926ebc32e1a9ada3' 
  AND token = 'knquYoTPcGwg+Ilr/HevfdHsQ/2ecCcwQHL/UjYXa7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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