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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24eda8458d57aa9d31a19531f053e59b878ce36b682db183660bd72d62da066a' 
  AND token = 'sbXj+0h6bOGiUuCBihKI088Keac2QwaVQ+963E8JowY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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