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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a98c5c4d58e582eec66d9a908d8f972d4754b2d4d32f4a4a69307584906d880' 
  AND token = 'N7waJyB22FQe3yY4mJ1AL9LETgiESxmVQRP/B6dQff4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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