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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1462d3adf017b72fbd3d28653bf8edccc35d77c9750b89d0ec563624601816f2' 
  AND token = 'g/ceNGse5QWBpC+xFSNo+c5cFOJc4zJb8852jljbgn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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