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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b0b595a9b9319efd04afd424091db7088b93e07c3e36e0b905cf176d0063ba6' 
  AND token = 'bz259VOTPPcrlwQ2OeQPD063ditO9Tciy9Oo8vmOsHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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