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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e96e3c3f389561856b6c81432db50027446aac8d1b029113a65abfee7ed1f1d' 
  AND token = 'grSYFf1xa8WQtYAS/w2APYU7YVPGU3WSyCm4QD90I+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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