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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cab9ad69efc54601c8750cab17f326332c95464e44e31a62a8dc24a535853768' 
  AND token = 'qbqzFxBb4oDQFOpzzZRAS7V7XaonMiiMB9MrLFI/9zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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