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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfcab768eaf786d250fce0ea7c562d1350d7cfa73533b69d46d1a0066b16b0ba' 
  AND token = 'hI/o22uZDcTJ2RlK0UOJfOtu/cRoznvXsA494SV0bNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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