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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '672a993984dd41b6e9043b4ff3b1959e0c12f0061bd26dd5ca13afc409244734' 
  AND token = 'sop42W1K4zAg742VsW6PeagT+TEWky8ctOwypFW+UEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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