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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2a5fe226da12b4aa4861d8151f07e815763c11885b912db2237feb8e5993a4f' 
  AND token = 'fjdAw0rQW8jrPoVG3r9psl5jewQYcrfEo3MzAKFtRw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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