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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f86eed0852796a06e14ec4c1c134a07b61ea83739864a03313d73b91ca4bb41a' 
  AND token = 'xpw134oiHssFDU4Oo8NdSDXKBBU+e4eOkKAWFnF+1SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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