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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9664c4e71f9584e01f20fe59ce676c36d3cfd5b90ad2a2442ff3b4c96178bf5' 
  AND token = 'rmLOmZuIfeaj9Awt2X9wY9buUEbmExRcImrBIDDBZ+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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