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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82944d4abfcf0a78f64040db331f1dcd41081f16290248ad7ee9300f7c011d15' 
  AND token = '/RhioIQOuXJQXlbBrRlgNraUdjWCnRuT/Yl13aL2lv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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