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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '176fb59fc0b63923ae6c509cb7af8e136293beb28b5fb8f5a6963336cb254ff9' 
  AND token = 'XfAodoos4okHoJzL3XmuabcbgAdFr6aU0luTybp+h0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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