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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43d5e80fcc72750a50b1a7231eee3d5e57ab728e961f0c3ad72e6dee2642f237' 
  AND token = 'kScxHCI82xIOxASgHc4lPheUpK9P2ft83IJTuqwxmLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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