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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7203ae1e5a7481732a20ec885c7bf3dee94ceea6ee96e5703e1699bd16a61c85' 
  AND token = 'JHWkA+rR7mDYwKLm2wbIO7iS1vPx8f6YMXwIUtVTqMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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