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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3a899e750cb5e00e32efd16ca94c55dc0dc8399f3b663991d95f0fd40e6d5e1' 
  AND token = 'y0UcXeM31zsHQPo92Gh8kj8FyYHgcsHgmFW95lC4PP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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