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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d16223e67d99a0f0d7956beb3a3acdc0f0e0327c7d8e0e84360076a409adad8' 
  AND token = '9uO3+/zTuhq0PUUpNsaNRzWuamTRVFfI/VtllN0ghx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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