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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af26d14b361da7926df6e9c37cef99f09f28edb6ea4a9191836c9efc0099b686' 
  AND token = '1YkGe8YW6u4wU6oD/MRRB22wKszbLc7yshGvsPhbDQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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