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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '309d41b204464cfaf11905df1d268a94f85cdc92cc42fcad631441f21fbcb4f5' 
  AND token = 'ivH2mW0Eff3SQPVWGmOP2QHjgmhMj1Pe3fEUEoqFZMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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