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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87cc1cafc54c439a68fa3f0d394e80ab8b9e8f6dd478c02aba0517bb0afad027' 
  AND token = '0onz16uhO80CNTGHAbnf1GE5zGzYoTVVn+h8fttBCU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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