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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c9bec1afd659e0b3f140ec8ef1ff7ca87cc4512b627a73eaf778846b3f27a20' 
  AND token = 'qd6P2au0TczSxKDKgHpCpNsCFLSCFlYFIZ1bG7NiCY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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