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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8bec8f24fdc0aa6eaa9e479466fbeaa3ed2d1e44d6ef987ddba67ef637b0cf1' 
  AND token = 'xF2jejg6+NZsvzJL44FTk9STTfoRE8E2WmqA1FD4X1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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