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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '832b5722bcebe0c2393a394c53f5cba9b48c4573ce517a867315c8333bfb926e' 
  AND token = 'mpsJ6CHNbshj2rJohRG99dFJ9BppJHHWlTJf5xcjJBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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