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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd56240b988ed2482090d2ca7fb791428f24c19489a6cb22cfb7edb14eb9497f6' 
  AND token = 'Mv38649Mc013GjxaZysfU81jkzUS9I+5ONOgyEd3BeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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