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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b74a7c652e4533b9a8c8b034893e6bac713f05af388f0d628862a364532a7383' 
  AND token = 'VJm/h4eZfesHt9xroYi/R2YRbIZZkG2ARS9iMbHuFpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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