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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0be4fe203e2546aabc96c59df7063e499e23282f1c18c8c765a20e7715827965' 
  AND token = 'z+jGw7Z8Jfrc5DxFm10DLULz2WXRdErEEGTNZz7DSM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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