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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7188b28cc1b7b2db6a569a8d652115555d71e47f5dc5d9e69dcb197c26253859' 
  AND token = 'LjBbkKeJbcxRa+ew1GK07KWOXE6TfLVzPP1jonF1AdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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