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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff96e03c6db345aa34a5ef7664d693846b0bd0adb35f234581e559e6a5f4e19e' 
  AND token = 'kCNyi8wQTU/xYJuAVar5f5Sllv8G0DBbspFIMQ/ErLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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