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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce3f3a032155a2466f5868351eb9d733f28ea1871844b78e05063b63151104a2' 
  AND token = '/lQSn4lmjxCYnB5v6XiNJI+C6j1kz0i3qJnWPM+931I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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