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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '981be34f08ec077bdf0a30e1d091f9aef60b317f8a26a01ba1296d3e370c1370' 
  AND token = 'LjZTVdF7WQKKqzorXbtkZSOOWjvaDhRtfDzN6gXhE6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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