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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29aaa72636493899410d86d2aaa4e1eb55a46aaaee4e3eca1325684b5ffd34ff' 
  AND token = '/X/sLVohHyKUEKWZFeI+Fx/DFs5zWMSwV2jaX8La10w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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