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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e72ec599cb1f46b5e902213159eeb516b691ef5d35eb500af32dc8f22eadfae4' 
  AND token = 'LViO6kaEjhmJLqJFDGpKAdmes5FHV5hESI5jX718Dhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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