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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f53e0d00b84b14f4099f2f7bb86bddec695a314628a8c8eab3f8e10289f80592' 
  AND token = '2da0tnGk9AyI0w6p1YpmeQHFvhoLDYe5zJvuwaBFbOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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