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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c22dfdb3930d844d96b113ac44d9fa969419ca7d11fe6bac033f3f8d13ba5390' 
  AND token = '3QwyAWEWdO9M2BdWPii2qmT5V0OtBW/MBP09VAtD+fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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