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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af39ef05ec279373b504a784770b738317b6904414f8f4a2302c867e097c172d' 
  AND token = 't22Baaq/snztykRR8OtQitgGuGe6He2lvmyXcG8Kfi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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